(Yes, the Super Nintendo World Power-Up Bands are amiibo—just as much so as any other amiibo figure, card, or plush, if you weren’t already aware.)
https://preview.redd.it/vrsmuwf4g5pa1.png?width=3024&format=png&auto=webp&v=enabled&s=a7eef79bb695b1470e487bde041d2deee9d659f6My Golden Power-Up Band just arrived today, and I can confirm that it does indeed have different ID data than the standard Mario Power-Up Band, with a unique print ID (meaning it’s more of a unique amiibo than the two Dark Skylanders amiibo, though those tend to still be counted as unique due to differing on the Skylanders side), which officially makes it the 840th unique amiibo released.
In other words, it’s necessary for 100% complete collections, so don’t miss out on the chance to get one while it’s available!
And for anyone interested, here’s the Golden Power-Up Band’s amiibo ID data, since I’ve not seen it shared anywhere online yet: 00000003 0430FF02